OBD-II code · Network
U0652 Lost Communication With EGR Sensor B
The vehicle bus reports loss of communication with smart EGR sensor B (position or flow). EGR closed-loop control loses its actual feedback.
Is it safe to drive with U0652?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Egr Sensor B, Vehicle Bus Wiring
Related codes
- U0651Lost Communication With EGR Sensor A
- U0653Lost Communication With EGR Sensor C
- U0669Lost Communication With EGR Sensor D
- U066ALost Communication With EGR Sensor E
- U064FLost Communication With Intake Manifold Runner Position Sensor Bank 1
- U0650Lost Communication With Exhaust Pressure Control Valve A Sensor/Switch
- U0654Lost Communication With Diesel Intake Air Flow A Position Sensor
- U0655Lost Communication With Diesel Intake Air Flow B Position Sensor
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.